/* doio.c * * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, * 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 by Larry Wall and others * * You may distribute under the terms of either the GNU General Public * License or the Artistic License, as specified in the README file. * */ /* * Far below them they saw the white waters pour into a foaming bowl, and * then swirl darkly about a deep oval basin in the rocks, until they found * their way out again through a narrow gate, and flowed away, fuming and * chattering, into calmer and more level reaches. * * [p.684 of _The Lord of the Rings_, IV/vi: "The Forbidden Pool"] */ /* This file contains functions that do the actual I/O on behalf of ops. * For example, pp_print() calls the do_print() function in this file for * each argument needing printing. */ #include "EXTERN.h" #define PERL_IN_DOIO_C #include "perl.h" #if defined(HAS_MSG) || defined(HAS_SEM) || defined(HAS_SHM) #ifndef HAS_SEM #include #endif #ifdef HAS_MSG #include #endif #ifdef HAS_SHM #include # ifndef HAS_SHMAT_PROTOTYPE extern Shmat_t shmat (int, char *, int); # endif #endif #endif #ifdef I_UTIME # if defined(_MSC_VER) || defined(__MINGW32__) # include # else # include # endif #endif #ifdef O_EXCL # define OPEN_EXCL O_EXCL #else # define OPEN_EXCL 0 #endif #define PERL_MODE_MAX 8 #define PERL_FLAGS_MAX 10 #include static IO * S_openn_setup(pTHX_ GV *gv, char *mode, PerlIO **saveifp, PerlIO **saveofp, int *savefd, char *savetype) { IO * const io = GvIOn(gv); PERL_ARGS_ASSERT_OPENN_SETUP; *saveifp = NULL; *saveofp = NULL; *savefd = -1; *savetype = IoTYPE_CLOSED; Zero(mode,sizeof(mode),char); PL_forkprocess = 1; /* assume true if no fork */ /* If currently open - close before we re-open */ if (IoIFP(io)) { if (IoTYPE(io) == IoTYPE_STD) { /* This is a clone of one of STD* handles */ } else { const int old_fd = PerlIO_fileno(IoIFP(io)); if (old_fd >= 0 && old_fd <= PL_maxsysfd) { /* This is one of the original STD* handles */ *saveifp = IoIFP(io); *saveofp = IoOFP(io); *savetype = IoTYPE(io); *savefd = old_fd; } else { int result; if (IoTYPE(io) == IoTYPE_PIPE) result = PerlProc_pclose(IoIFP(io)); else if (IoIFP(io) != IoOFP(io)) { if (IoOFP(io)) { result = PerlIO_close(IoOFP(io)); PerlIO_close(IoIFP(io)); /* clear stdio, fd already closed */ } else result = PerlIO_close(IoIFP(io)); } else result = PerlIO_close(IoIFP(io)); if (result == EOF && old_fd > PL_maxsysfd) { /* Why is this not Perl_warn*() call ? */ PerlIO_printf(Perl_error_log, "Warning: unable to close filehandle %" HEKf " properly.\n", HEKfARG(GvENAME_HEK(gv)) ); } } } IoOFP(io) = IoIFP(io) = NULL; } return io; } bool Perl_do_openn(pTHX_ GV *gv, const char *oname, I32 len, int as_raw, int rawmode, int rawperm, PerlIO *supplied_fp, SV **svp, I32 num_svs) { PERL_ARGS_ASSERT_DO_OPENN; if (as_raw) { /* sysopen style args, i.e. integer mode and permissions */ if (num_svs != 0) { Perl_croak(aTHX_ "panic: sysopen with multiple args, num_svs=%ld", (long) num_svs); } return do_open_raw(gv, oname, len, rawmode, rawperm, NULL); } return do_open6(gv, oname, len, supplied_fp, svp, num_svs); } bool Perl_do_open_raw(pTHX_ GV *gv, const char *oname, STRLEN len, int rawmode, int rawperm, Stat_t *statbufp) { PerlIO *saveifp; PerlIO *saveofp; int savefd; char savetype; char mode[PERL_MODE_MAX]; /* file mode ("r\0", "rb\0", "ab\0" etc.) */ IO * const io = openn_setup(gv, mode, &saveifp, &saveofp, &savefd, &savetype); int writing = 0; PerlIO *fp; PERL_ARGS_ASSERT_DO_OPEN_RAW; /* For ease of blame back to 5.000, keep the existing indenting. */ { /* sysopen style args, i.e. integer mode and permissions */ STRLEN ix = 0; const int appendtrunc = 0 #ifdef O_APPEND /* Not fully portable. */ |O_APPEND #endif #ifdef O_TRUNC /* Not fully portable. */ |O_TRUNC #endif ; const int modifyingmode = O_WRONLY|O_RDWR|O_CREAT|appendtrunc; int ismodifying; SV *namesv; /* It's not always O_RDONLY 0 O_WRONLY 1 O_RDWR 2 It might be (in OS/390 and Mac OS Classic it is) O_WRONLY 1 O_RDONLY 2 O_RDWR 3 This means that simple & with O_RDWR would look like O_RDONLY is present. Therefore we have to be more careful. */ if ((ismodifying = (rawmode & modifyingmode))) { if ((ismodifying & O_WRONLY) == O_WRONLY || (ismodifying & O_RDWR) == O_RDWR || (ismodifying & (O_CREAT|appendtrunc))) TAINT_PROPER("sysopen"); } mode[ix++] = IoTYPE_NUMERIC; /* Marker to openn to use numeric "sysopen" */ #if defined(USE_64_BIT_RAWIO) && defined(O_LARGEFILE) rawmode |= O_LARGEFILE; /* Transparently largefiley. */ #endif IoTYPE(io) = PerlIO_intmode2str(rawmode, &mode[ix], &writing); namesv = newSVpvn_flags(oname, len, SVs_TEMP); fp = PerlIO_openn(aTHX_ NULL, mode, -1, rawmode, rawperm, NULL, 1, &namesv); } return openn_cleanup(gv, io, fp, mode, oname, saveifp, saveofp, savefd, savetype, writing, 0, NULL, statbufp); } bool Perl_do_open6(pTHX_ GV *gv, const char *oname, STRLEN len, PerlIO *supplied_fp, SV **svp, U32 num_svs) { PerlIO *saveifp; PerlIO *saveofp; int savefd; char savetype; char mode[PERL_MODE_MAX]; /* file mode ("r\0", "rb\0", "ab\0" etc.) */ IO * const io = openn_setup(gv, mode, &saveifp, &saveofp, &savefd, &savetype); int writing = 0; PerlIO *fp; bool was_fdopen = FALSE; char *type = NULL; PERL_ARGS_ASSERT_DO_OPEN6; /* For ease of blame back to 5.000, keep the existing indenting. */ { /* Regular (non-sys) open */ char *name; STRLEN olen = len; char *tend; int dodup = 0; bool in_raw = 0, in_crlf = 0, out_raw = 0, out_crlf = 0; /* Collect default raw/crlf info from the op */ if (PL_op && PL_op->op_type == OP_OPEN) { /* set up IO layers */ const U8 flags = PL_op->op_private; in_raw = (flags & OPpOPEN_IN_RAW); in_crlf = (flags & OPpOPEN_IN_CRLF); out_raw = (flags & OPpOPEN_OUT_RAW); out_crlf = (flags & OPpOPEN_OUT_CRLF); } type = savepvn(oname, len); tend = type+len; SAVEFREEPV(type); /* Lose leading and trailing white space */ while (isSPACE(*type)) type++; while (tend > type && isSPACE(tend[-1])) *--tend = '\0'; if (num_svs) { const char *p; STRLEN nlen = 0; /* New style explicit name, type is just mode and layer info */ #ifdef USE_STDIO if (SvROK(*svp) && !strchr(oname,'&')) { if (ckWARN(WARN_IO)) Perl_warner(aTHX_ packWARN(WARN_IO), "Can't open a reference"); SETERRNO(EINVAL, LIB_INVARG); fp = NULL; goto say_false; } #endif /* USE_STDIO */ p = (SvOK(*svp) || SvGMAGICAL(*svp)) ? SvPV(*svp, nlen) : NULL; if (p && !IS_SAFE_PATHNAME(p, nlen, "open")) { fp = NULL; goto say_false; } name = p ? savepvn(p, nlen) : savepvs(""); SAVEFREEPV(name); } else { name = type; len = tend-type; } IoTYPE(io) = *type; if ((*type == IoTYPE_RDWR) && /* scary */ (*(type+1) == IoTYPE_RDONLY || *(type+1) == IoTYPE_WRONLY) && ((!num_svs || (tend > type+1 && tend[-1] != IoTYPE_PIPE)))) { TAINT_PROPER("open"); mode[1] = *type++; writing = 1; } if (*type == IoTYPE_PIPE) { if (num_svs) { if (type[1] != IoTYPE_STD) { unknown_open_mode: Perl_croak(aTHX_ "Unknown open() mode '%.*s'", (int)olen, oname); } type++; } do { type++; } while (isSPACE(*type)); if (!num_svs) { name = type; len = tend-type; } if (*name == '\0') { /* command is missing 19990114 */ if (ckWARN(WARN_PIPE)) Perl_warner(aTHX_ packWARN(WARN_PIPE), "Missing command in piped open"); errno = EPIPE; fp = NULL; goto say_false; } if (!(*name == '-' && name[1] == '\0') || num_svs) TAINT_ENV(); TAINT_PROPER("piped open"); if (!num_svs && name[len-1] == '|') { name[--len] = '\0' ; if (ckWARN(WARN_PIPE)) Perl_warner(aTHX_ packWARN(WARN_PIPE), "Can't open bidirectional pipe"); } mode[0] = 'w'; writing = 1; if (out_raw) mode[1] = 'b'; else if (out_crlf) mode[1] = 't'; if (num_svs > 1) { fp = PerlProc_popen_list(mode, num_svs, svp); } else { fp = PerlProc_popen(name,mode); } if (num_svs) { if (*type) { if (PerlIO_apply_layers(aTHX_ fp, mode, type) != 0) { fp = NULL; goto say_false; } } } } /* IoTYPE_PIPE */ else if (*type == IoTYPE_WRONLY) { TAINT_PROPER("open"); type++; if (*type == IoTYPE_WRONLY) { /* Two IoTYPE_WRONLYs in a row make for an IoTYPE_APPEND. */ mode[0] = IoTYPE(io) = IoTYPE_APPEND; type++; } else { mode[0] = 'w'; } writing = 1; if (out_raw) mode[1] = 'b'; else if (out_crlf) mode[1] = 't'; if (*type == '&') { duplicity: dodup = PERLIO_DUP_FD; type++; if (*type == '=') { dodup = 0; type++; } if (!num_svs && !*type && supplied_fp) { /* "<+&" etc. is used by typemaps */ fp = supplied_fp; } else { PerlIO *that_fp = NULL; int wanted_fd; UV uv; if (num_svs > 1) { /* diag_listed_as: More than one argument to '%s' open */ Perl_croak(aTHX_ "More than one argument to '%c&' open",IoTYPE(io)); } while (isSPACE(*type)) type++; if (num_svs && ( SvIOK(*svp) || (SvPOKp(*svp) && looks_like_number(*svp)) )) { wanted_fd = SvUV(*svp); num_svs = 0; } else if (isDIGIT(*type) && grok_atoUV(type, &uv, NULL) && uv <= INT_MAX ) { wanted_fd = (int)uv; } else { const IO* thatio; if (num_svs) { thatio = sv_2io(*svp); } else { GV * const thatgv = gv_fetchpvn_flags(type, tend - type, 0, SVt_PVIO); thatio = GvIO(thatgv); } if (!thatio) { #ifdef EINVAL SETERRNO(EINVAL,SS_IVCHAN); #endif fp = NULL; goto say_false; } if ((that_fp = IoIFP(thatio))) { /* Flush stdio buffer before dup. --mjd * Unfortunately SEEK_CURing 0 seems to * be optimized away on most platforms; * only Solaris and Linux seem to flush * on that. --jhi */ /* On the other hand, do all platforms * take gracefully to flushing a read-only * filehandle? Perhaps we should do * fsetpos(src)+fgetpos(dst)? --nik */ PerlIO_flush(that_fp); wanted_fd = PerlIO_fileno(that_fp); /* When dup()ing STDIN, STDOUT or STDERR * explicitly set appropriate access mode */ if (that_fp == PerlIO_stdout() || that_fp == PerlIO_stderr()) IoTYPE(io) = IoTYPE_WRONLY; else if (that_fp == PerlIO_stdin()) IoTYPE(io) = IoTYPE_RDONLY; /* When dup()ing a socket, say result is * one as well */ else if (IoTYPE(thatio) == IoTYPE_SOCKET) IoTYPE(io) = IoTYPE_SOCKET; } else { SETERRNO(EBADF, RMS_IFI); fp = NULL; goto say_false; } } if (!num_svs) type = NULL; if (that_fp) { fp = PerlIO_fdupopen(aTHX_ that_fp, NULL, dodup); } else { if (dodup) wanted_fd = PerlLIO_dup(wanted_fd); else was_fdopen = TRUE; if (!(fp = PerlIO_openn(aTHX_ type,mode,wanted_fd,0,0,NULL,num_svs,svp))) { if (dodup && wanted_fd >= 0) PerlLIO_close(wanted_fd); } } } } /* & */ else { while (isSPACE(*type)) type++; if (*type == IoTYPE_STD && (!type[1] || isSPACE(type[1]) || type[1] == ':')) { type++; fp = PerlIO_stdout(); IoTYPE(io) = IoTYPE_STD; if (num_svs > 1) { /* diag_listed_as: More than one argument to '%s' open */ Perl_croak(aTHX_ "More than one argument to '>%c' open",IoTYPE_STD); } } else { if (num_svs) { fp = PerlIO_openn(aTHX_ type,mode,-1,0,0,NULL,num_svs,svp); } else { SV *namesv = newSVpvn_flags(type, tend - type, SVs_TEMP); type = NULL; fp = PerlIO_openn(aTHX_ type,mode,-1,0,0,NULL,1,&namesv); } } } /* !& */ if (!fp && type && *type && *type != ':' && !isIDFIRST(*type)) goto unknown_open_mode; } /* IoTYPE_WRONLY */ else if (*type == IoTYPE_RDONLY) { do { type++; } while (isSPACE(*type)); mode[0] = 'r'; if (in_raw) mode[1] = 'b'; else if (in_crlf) mode[1] = 't'; if (*type == '&') { goto duplicity; } if (*type == IoTYPE_STD && (!type[1] || isSPACE(type[1]) || type[1] == ':')) { type++; fp = PerlIO_stdin(); IoTYPE(io) = IoTYPE_STD; if (num_svs > 1) { /* diag_listed_as: More than one argument to '%s' open */ Perl_croak(aTHX_ "More than one argument to '<%c' open",IoTYPE_STD); } } else { if (num_svs) { fp = PerlIO_openn(aTHX_ type,mode,-1,0,0,NULL,num_svs,svp); } else { SV *namesv = newSVpvn_flags(type, tend - type, SVs_TEMP); type = NULL; fp = PerlIO_openn(aTHX_ type,mode,-1,0,0,NULL,1,&namesv); } } if (!fp && type && *type && *type != ':' && !isIDFIRST(*type)) goto unknown_open_mode; } /* IoTYPE_RDONLY */ else if ((num_svs && /* '-|...' or '...|' */ type[0] == IoTYPE_STD && type[1] == IoTYPE_PIPE) || (!num_svs && tend > type+1 && tend[-1] == IoTYPE_PIPE)) { if (num_svs) { type += 2; /* skip over '-|' */ } else { *--tend = '\0'; while (tend > type && isSPACE(tend[-1])) *--tend = '\0'; for (; isSPACE(*type); type++) ; name = type; len = tend-type; } if (*name == '\0') { /* command is missing 19990114 */ if (ckWARN(WARN_PIPE)) Perl_warner(aTHX_ packWARN(WARN_PIPE), "Missing command in piped open"); errno = EPIPE; fp = NULL; goto say_false; } if (!(*name == '-' && name[1] == '\0') || num_svs) TAINT_ENV(); TAINT_PROPER("piped open"); mode[0] = 'r'; if (in_raw) mode[1] = 'b'; else if (in_crlf) mode[1] = 't'; if (num_svs > 1) { fp = PerlProc_popen_list(mode,num_svs,svp); } else { fp = PerlProc_popen(name,mode); } IoTYPE(io) = IoTYPE_PIPE; if (num_svs) { while (isSPACE(*type)) type++; if (*type) { if (PerlIO_apply_layers(aTHX_ fp, mode, type) != 0) { fp = NULL; goto say_false; } } } } else { /* layer(Args) */ if (num_svs) goto unknown_open_mode; name = type; IoTYPE(io) = IoTYPE_RDONLY; for (; isSPACE(*name); name++) ; mode[0] = 'r'; if (in_raw) mode[1] = 'b'; else if (in_crlf) mode[1] = 't'; if (*name == '-' && name[1] == '\0') { fp = PerlIO_stdin(); IoTYPE(io) = IoTYPE_STD; } else { if (num_svs) { fp = PerlIO_openn(aTHX_ type,mode,-1,0,0,NULL,num_svs,svp); } else { SV *namesv = newSVpvn_flags(type, tend - type, SVs_TEMP); type = NULL; fp = PerlIO_openn(aTHX_ type,mode,-1,0,0,NULL,1,&namesv); } } } } say_false: return openn_cleanup(gv, io, fp, mode, oname, saveifp, saveofp, savefd, savetype, writing, was_fdopen, type, NULL); } /* Yes, this is ugly, but it's private, and I don't see a cleaner way to simplify the two-headed public interface of do_openn. */ static bool S_openn_cleanup(pTHX_ GV *gv, IO *io, PerlIO *fp, char *mode, const char *oname, PerlIO *saveifp, PerlIO *saveofp, int savefd, char savetype, int writing, bool was_fdopen, const char *type, Stat_t *statbufp) { int fd; Stat_t statbuf; PERL_ARGS_ASSERT_OPENN_CLEANUP; if (!fp) { if (IoTYPE(io) == IoTYPE_RDONLY && ckWARN(WARN_NEWLINE) && should_warn_nl(oname) ) { GCC_DIAG_IGNORE(-Wformat-nonliteral); /* PL_warn_nl is constant */ Perl_warner(aTHX_ packWARN(WARN_NEWLINE), PL_warn_nl, "open"); GCC_DIAG_RESTORE; } goto say_false; } if (ckWARN(WARN_IO)) { if ((IoTYPE(io) == IoTYPE_RDONLY) && (fp == PerlIO_stdout() || fp == PerlIO_stderr())) { Perl_warner(aTHX_ packWARN(WARN_IO), "Filehandle STD%s reopened as %" HEKf " only for input", ((fp == PerlIO_stdout()) ? "OUT" : "ERR"), HEKfARG(GvENAME_HEK(gv))); } else if ((IoTYPE(io) == IoTYPE_WRONLY) && fp == PerlIO_stdin()) { Perl_warner(aTHX_ packWARN(WARN_IO), "Filehandle STDIN reopened as %" HEKf " only for output", HEKfARG(GvENAME_HEK(gv)) ); } } fd = PerlIO_fileno(fp); /* Do NOT do: "if (fd < 0) goto say_false;" here. If there is no * fd assume it isn't a socket - this covers PerlIO::scalar - * otherwise unless we "know" the type probe for socket-ness. */ if (IoTYPE(io) && IoTYPE(io) != IoTYPE_PIPE && IoTYPE(io) != IoTYPE_STD && fd >= 0) { if (PerlLIO_fstat(fd,&statbuf) < 0) { /* If PerlIO claims to have fd we had better be able to fstat() it. */ (void) PerlIO_close(fp); goto say_false; } #ifndef PERL_MICRO if (S_ISSOCK(statbuf.st_mode)) IoTYPE(io) = IoTYPE_SOCKET; /* in case a socket was passed in to us */ #ifdef HAS_SOCKET else if ( !(statbuf.st_mode & S_IFMT) && IoTYPE(io) != IoTYPE_WRONLY /* Dups of STD* filehandles already have */ && IoTYPE(io) != IoTYPE_RDONLY /* type so they aren't marked as sockets */ ) { /* on OS's that return 0 on fstat()ed pipe */ char tmpbuf[256]; Sock_size_t buflen = sizeof tmpbuf; if (PerlSock_getsockname(fd, (struct sockaddr *)tmpbuf, &buflen) >= 0 || errno != ENOTSOCK) IoTYPE(io) = IoTYPE_SOCKET; /* some OS's return 0 on fstat()ed socket */ /* but some return 0 for streams too, sigh */ } #endif /* HAS_SOCKET */ #endif /* !PERL_MICRO */ } /* Eeek - FIXME !!! * If this is a standard handle we discard all the layer stuff * and just dup the fd into whatever was on the handle before ! */ if (saveifp) { /* must use old fp? */ /* If fd is less that PL_maxsysfd i.e. STDIN..STDERR then dup the new fileno down */ if (saveofp) { PerlIO_flush(saveofp); /* emulate PerlIO_close() */ if (saveofp != saveifp) { /* was a socket? */ PerlIO_close(saveofp); } } if (savefd != fd) { /* Still a small can-of-worms here if (say) PerlIO::scalar is assigned to (say) STDOUT - for now let dup2() fail and provide the error */ if (fd < 0) { SETERRNO(EBADF,RMS_IFI); goto say_false; } else if (PerlLIO_dup2(fd, savefd) < 0) { (void)PerlIO_close(fp); goto say_false; } #ifdef VMS if (savefd != PerlIO_fileno(PerlIO_stdin())) { char newname[FILENAME_MAX+1]; if (PerlIO_getname(fp, newname)) { if (fd == PerlIO_fileno(PerlIO_stdout())) vmssetuserlnm("SYS$OUTPUT", newname); if (fd == PerlIO_fileno(PerlIO_stderr())) vmssetuserlnm("SYS$ERROR", newname); } } #endif #if !defined(WIN32) /* PL_fdpid isn't used on Windows, so avoid this useless work. * XXX Probably the same for a lot of other places. */ { Pid_t pid; SV *sv; sv = *av_fetch(PL_fdpid,fd,TRUE); SvUPGRADE(sv, SVt_IV); pid = SvIVX(sv); SvIV_set(sv, 0); sv = *av_fetch(PL_fdpid,savefd,TRUE); SvUPGRADE(sv, SVt_IV); SvIV_set(sv, pid); } #endif if (was_fdopen) { /* need to close fp without closing underlying fd */ int ofd = PerlIO_fileno(fp); int dupfd = ofd >= 0 ? PerlLIO_dup(ofd) : -1; #if defined(HAS_FCNTL) && defined(F_SETFD) /* Assume if we have F_SETFD we have F_GETFD. */ /* Get a copy of all the fd flags. */ int fd_flags = ofd >= 0 ? fcntl(ofd, F_GETFD) : -1; if (fd_flags < 0) { if (dupfd >= 0) PerlLIO_close(dupfd); goto say_false; } #endif if (ofd < 0 || dupfd < 0) { if (dupfd >= 0) PerlLIO_close(dupfd); goto say_false; } PerlIO_close(fp); PerlLIO_dup2(dupfd, ofd); #if defined(HAS_FCNTL) && defined(F_SETFD) /* The dup trick has lost close-on-exec on ofd, * and possibly any other flags, so restore them. */ if (fcntl(ofd,F_SETFD, fd_flags) < 0) { if (dupfd >= 0) PerlLIO_close(dupfd); goto say_false; } #endif PerlLIO_close(dupfd); } else PerlIO_close(fp); } fp = saveifp; PerlIO_clearerr(fp); fd = PerlIO_fileno(fp); } #if defined(HAS_FCNTL) && defined(F_SETFD) && defined(FD_CLOEXEC) if (fd >= 0 && fd > PL_maxsysfd && fcntl(fd, F_SETFD, FD_CLOEXEC) < 0) { PerlLIO_close(fd); goto say_false; } #endif IoIFP(io) = fp; IoFLAGS(io) &= ~IOf_NOLINE; if (writing) { if (IoTYPE(io) == IoTYPE_SOCKET || (IoTYPE(io) == IoTYPE_WRONLY && fd >= 0 && S_ISCHR(statbuf.st_mode)) ) { char *s = mode; if (*s == IoTYPE_IMPLICIT || *s == IoTYPE_NUMERIC) s++; *s = 'w'; if (!(IoOFP(io) = PerlIO_openn(aTHX_ type,s,fd,0,0,NULL,0,NULL))) { PerlIO_close(fp); goto say_false; } } else IoOFP(io) = fp; } if (statbufp) *statbufp = statbuf; return TRUE; say_false: IoIFP(io) = saveifp; IoOFP(io) = saveofp; IoTYPE(io) = savetype; return FALSE; } /* Open a temp file in the same directory as an original name. */ static bool S_openindirtemp(pTHX_ GV *gv, SV *orig_name, SV *temp_out_name) { int fd; PerlIO *fp; const char *p = SvPV_nolen(orig_name); const char *sep; /* look for the last directory separator */ sep = strrchr(p, '/'); #ifdef DOSISH { const char *sep2; if ((sep2 = strrchr(sep ? sep : p, '\\'))) sep = sep2; } #endif #ifdef VMS if (!sep) { const char *openp = strchr(p, '['); if (openp) sep = strchr(openp, ']'); else { sep = strchr(p, ':'); } } #endif if (sep) { sv_setpvn(temp_out_name, p, sep - p + 1); sv_catpvs(temp_out_name, "XXXXXXXX"); } else sv_setpvs(temp_out_name, "XXXXXXXX"); fd = Perl_my_mkstemp(SvPVX(temp_out_name)); if (fd < 0) return FALSE; fp = PerlIO_fdopen(fd, "w+"); if (!fp) return FALSE; return do_openn(gv, "+>&", 3, 0, 0, 0, fp, NULL, 0); } #if defined(HAS_UNLINKAT) && defined(HAS_RENAMEAT) && defined(HAS_FCHMODAT) && \ (defined(HAS_DIRFD) || defined(HAS_DIR_DD_FD)) && !defined(NO_USE_ATFUNCTIONS) && \ defined(HAS_LINKAT) # define ARGV_USE_ATFUNCTIONS #endif /* Win32 doesn't necessarily return useful information * in st_dev, st_ino. */ #ifndef ARGV_USE_ATFUNCTIONS # ifndef DOSISH # define ARGV_USE_STAT_INO # endif #endif #define ARGVMG_BACKUP_NAME 0 #define ARGVMG_TEMP_NAME 1 #define ARGVMG_ORIG_NAME 2 #define ARGVMG_ORIG_MODE 3 #define ARGVMG_ORIG_PID 4 #if defined(ARGV_USE_ATFUNCTIONS) #define ARGVMG_ORIG_DIRP 5 #elif defined(ARGV_USE_STAT_INO) /* we store the entire stat_t since the ino_t and dev_t values might not fit in an IV. I could have created a new structure and transferred them across, but this seemed too much effort for very little win. */ #define ARGVMG_ORIG_CWD_STAT 5 #endif static int S_argvout_free(pTHX_ SV *io, MAGIC *mg) { SV **temp_psv; PERL_UNUSED_ARG(io); /* note this can be entered once the file has been successfully deleted too */ assert(IoTYPE(io) != IoTYPE_PIPE); /* mg_obj can be NULL if a thread is created with the handle open, in which case we leave any clean up to the parent thread */ if (mg->mg_obj && IoIFP(io)) { SV **pid_psv; #ifdef ARGV_USE_ATFUNCTIONS SV **dir_psv; DIR *dir; #endif PerlIO *iop = IoIFP(io); assert(SvTYPE(mg->mg_obj) == SVt_PVAV); pid_psv = av_fetch((AV*)mg->mg_obj, ARGVMG_ORIG_PID, FALSE); assert(pid_psv && *pid_psv); if (SvIV(*pid_psv) == (IV)PerlProc_getpid()) { /* if we get here the file hasn't been closed explicitly by the user and hadn't been closed implicitly by nextargv(), so abandon the edit */ (void)PerlIO_close(iop); IoIFP(io) = IoOFP(io) = NULL; temp_psv = av_fetch((AV*)mg->mg_obj, ARGVMG_TEMP_NAME, FALSE); assert(temp_psv && *temp_psv && SvPOK(*temp_psv)); #ifdef ARGV_USE_ATFUNCTIONS dir_psv = av_fetch((AV*)mg->mg_obj, ARGVMG_ORIG_DIRP, FALSE); assert(dir_psv && *dir_psv && SvIOK(*dir_psv)); dir = INT2PTR(DIR *, SvIV(*dir_psv)); if (dir) { (void)unlinkat(my_dirfd(dir), SvPVX(*temp_psv), 0); closedir(dir); } #else (void)UNLINK(SvPVX(*temp_psv)); #endif } } return 0; } static int S_argvout_dup(pTHX_ MAGIC *mg, CLONE_PARAMS *param) { PERL_UNUSED_ARG(param); /* ideally we could just remove the magic from the SV but we don't get the SV here */ SvREFCNT_dec(mg->mg_obj); mg->mg_obj = NULL; return 0; } /* Magic of this type has an AV containing the following: 0: name of the backup file (if any) 1: name of the temp output file 2: name of the original file 3: file mode of the original file 4: pid of the process we opened at, to prevent doing the renaming etc in both the child and the parent after a fork If we have unlinkat(), renameat(), fchmodat(), dirfd() we also keep: 5: the DIR * for the current directory when we open the file, stored as an IV */ static const MGVTBL argvout_vtbl = { NULL, /* svt_get */ NULL, /* svt_set */ NULL, /* svt_len */ NULL, /* svt_clear */ S_argvout_free, /* svt_free */ NULL, /* svt_copy */ S_argvout_dup, /* svt_dup */ NULL /* svt_local */ }; PerlIO * Perl_nextargv(pTHX_ GV *gv, bool nomagicopen) { IO * const io = GvIOp(gv); SV *const old_out_name = PL_inplace ? newSVsv(GvSV(gv)) : NULL; PERL_ARGS_ASSERT_NEXTARGV; if (old_out_name) SAVEFREESV(old_out_name); if (!PL_argvoutgv) PL_argvoutgv = gv_fetchpvs("ARGVOUT", GV_ADD|GV_NOTQUAL, SVt_PVIO); if (io && (IoFLAGS(io) & (IOf_ARGV|IOf_START)) == (IOf_ARGV|IOf_START)) { IoFLAGS(io) &= ~IOf_START; if (PL_inplace) { assert(PL_defoutgv); Perl_av_create_and_push(aTHX_ &PL_argvout_stack, SvREFCNT_inc_simple_NN(PL_defoutgv)); } } { IO * const io = GvIOp(PL_argvoutgv); if (io && IoIFP(io) && old_out_name) { do_close(PL_argvoutgv, FALSE); } } PL_lastfd = -1; PL_filemode = 0; if (!GvAV(gv)) return NULL; while (av_tindex(GvAV(gv)) >= 0) { STRLEN oldlen; SV *const sv = av_shift(GvAV(gv)); SAVEFREESV(sv); SvTAINTED_off(GvSVn(gv)); /* previous tainting irrelevant */ sv_setsv(GvSVn(gv),sv); SvSETMAGIC(GvSV(gv)); PL_oldname = SvPVx(GvSV(gv), oldlen); if (LIKELY(!PL_inplace)) { if (nomagicopen ? do_open6(gv, "<", 1, NULL, &GvSV(gv), 1) : do_open6(gv, PL_oldname, oldlen, NULL, NULL, 0) ) { return IoIFP(GvIOp(gv)); } } else { Stat_t statbuf; /* This very long block ends with return IoIFP(GvIOp(gv)); Both this block and the block above fall through on open failure to the warning code, and then the while loop above tries the next entry. */ if (do_open_raw(gv, PL_oldname, oldlen, O_RDONLY, 0, &statbuf)) { #ifndef FLEXFILENAMES int filedev; int fileino; #endif #ifdef ARGV_USE_ATFUNCTIONS DIR *curdir; #endif Uid_t fileuid; Gid_t filegid; AV *magic_av = NULL; SV *temp_name_sv = NULL; MAGIC *mg; TAINT_PROPER("inplace open"); if (oldlen == 1 && *PL_oldname == '-') { setdefout(gv_fetchpvs("STDOUT", GV_ADD|GV_NOTQUAL, SVt_PVIO)); return IoIFP(GvIOp(gv)); } #ifndef FLEXFILENAMES filedev = statbuf.st_dev; fileino = statbuf.st_ino; #endif PL_filemode = statbuf.st_mode; fileuid = statbuf.st_uid; filegid = statbuf.st_gid; if (!S_ISREG(PL_filemode)) { Perl_ck_warner_d(aTHX_ packWARN(WARN_INPLACE), "Can't do inplace edit: %s is not a regular file", PL_oldname ); do_close(gv,FALSE); continue; } magic_av = newAV(); if (*PL_inplace && strNE(PL_inplace, "*")) { const char *star = strchr(PL_inplace, '*'); if (star) { const char *begin = PL_inplace; SvPVCLEAR(sv); do { sv_catpvn(sv, begin, star - begin); sv_catpvn(sv, PL_oldname, oldlen); begin = ++star; } while ((star = strchr(begin, '*'))); if (*begin) sv_catpv(sv,begin); } else { sv_catpv(sv,PL_inplace); } #ifndef FLEXFILENAMES if ((PerlLIO_stat(SvPVX_const(sv),&statbuf) >= 0 && statbuf.st_dev == filedev && statbuf.st_ino == fileino) #ifdef DJGPP || ((_djstat_fail_bits & _STFAIL_TRUENAME)!=0) #endif ) { Perl_ck_warner_d(aTHX_ packWARN(WARN_INPLACE), "Can't do inplace edit: %" SVf " would not be unique", SVfARG(sv)); goto cleanup_argv; } #endif av_store(magic_av, ARGVMG_BACKUP_NAME, newSVsv(sv)); } sv_setpvn(sv,PL_oldname,oldlen); SETERRNO(0,0); /* in case sprintf set errno */ temp_name_sv = newSV(0); if (!S_openindirtemp(aTHX_ PL_argvoutgv, GvSV(gv), temp_name_sv)) { SvREFCNT_dec(temp_name_sv); /* diag_listed_as: Can't do inplace edit on %s: %s */ Perl_ck_warner_d(aTHX_ packWARN(WARN_INPLACE), "Can't do inplace edit on %s: Cannot make temp name: %s", PL_oldname, Strerror(errno) ); #ifndef FLEXFILENAMES cleanup_argv: #endif do_close(gv,FALSE); SvREFCNT_dec(magic_av); continue; } av_store(magic_av, ARGVMG_TEMP_NAME, temp_name_sv); av_store(magic_av, ARGVMG_ORIG_NAME, newSVsv(sv)); av_store(magic_av, ARGVMG_ORIG_MODE, newSVuv(PL_filemode)); av_store(magic_av, ARGVMG_ORIG_PID, newSViv((IV)PerlProc_getpid())); #if defined(ARGV_USE_ATFUNCTIONS) curdir = opendir("."); av_store(magic_av, ARGVMG_ORIG_DIRP, newSViv(PTR2IV(curdir))); #elif defined(ARGV_USE_STAT_INO) if (PerlLIO_stat(".", &statbuf) >= 0) { av_store(magic_av, ARGVMG_ORIG_CWD_STAT, newSVpvn((char *)&statbuf, sizeof(statbuf))); } #endif setdefout(PL_argvoutgv); sv_setsv(GvSVn(PL_argvoutgv), temp_name_sv); mg = sv_magicext((SV*)GvIOp(PL_argvoutgv), (SV*)magic_av, PERL_MAGIC_uvar, &argvout_vtbl, NULL, 0); mg->mg_flags |= MGf_DUP; SvREFCNT_dec(magic_av); PL_lastfd = PerlIO_fileno(IoIFP(GvIOp(PL_argvoutgv))); if (PL_lastfd >= 0) { (void)PerlLIO_fstat(PL_lastfd,&statbuf); #ifdef HAS_FCHMOD (void)fchmod(PL_lastfd,PL_filemode); #else (void)PerlLIO_chmod(PL_oldname,PL_filemode); #endif if (fileuid != statbuf.st_uid || filegid != statbuf.st_gid) { /* XXX silently ignore failures */ #ifdef HAS_FCHOWN PERL_UNUSED_RESULT(fchown(PL_lastfd,fileuid,filegid)); #elif defined(HAS_CHOWN) PERL_UNUSED_RESULT(PerlLIO_chown(PL_oldname,fileuid,filegid)); #endif } } return IoIFP(GvIOp(gv)); } } /* successful do_open_raw(), PL_inplace non-NULL */ if (ckWARN_d(WARN_INPLACE)) { const int eno = errno; Stat_t statbuf; if (PerlLIO_stat(PL_oldname, &statbuf) >= 0 && !S_ISREG(statbuf.st_mode)) { Perl_warner(aTHX_ packWARN(WARN_INPLACE), "Can't do inplace edit: %s is not a regular file", PL_oldname); } else { Perl_warner(aTHX_ packWARN(WARN_INPLACE), "Can't open %s: %s", PL_oldname, Strerror(eno)); } } } if (io && (IoFLAGS(io) & IOf_ARGV)) IoFLAGS(io) |= IOf_START; if (PL_inplace) { if (io && (IoFLAGS(io) & IOf_ARGV) && PL_argvout_stack && AvFILLp(PL_argvout_stack) >= 0) { GV * const oldout = MUTABLE_GV(av_pop(PL_argvout_stack)); setdefout(oldout); SvREFCNT_dec_NN(oldout); return NULL; } setdefout(gv_fetchpvs("STDOUT", GV_ADD|GV_NOTQUAL, SVt_PVIO)); } return NULL; } #ifdef ARGV_USE_ATFUNCTIONS # if defined(__FreeBSD__) /* FreeBSD 11 renameat() mis-behaves strangely with absolute paths in cases where the * equivalent rename() succeeds */ static int S_my_renameat(int olddfd, const char *oldpath, int newdfd, const char *newpath) { /* this is intended only for use in Perl_do_close() */ assert(olddfd == newdfd); assert(PERL_FILE_IS_ABSOLUTE(oldpath) == PERL_FILE_IS_ABSOLUTE(newpath)); if (PERL_FILE_IS_ABSOLUTE(oldpath)) { return PerlLIO_rename(oldpath, newpath); } else { return renameat(olddfd, oldpath, newdfd, newpath); } } # else # define S_my_renameat(dh1, pv1, dh2, pv2) renameat((dh1), (pv1), (dh2), (pv2)) # endif /* if defined(__FreeBSD__) */ #endif /* explicit renamed to avoid C++ conflict -- kja */ bool Perl_do_close(pTHX_ GV *gv, bool not_implicit) { bool retval; IO *io; MAGIC *mg; if (!gv) gv = PL_argvgv; if (!gv || !isGV_with_GP(gv)) { if (not_implicit) SETERRNO(EBADF,SS_IVCHAN); return FALSE; } io = GvIO(gv); if (!io) { /* never opened */ if (not_implicit) { report_evil_fh(gv); SETERRNO(EBADF,SS_IVCHAN); } return FALSE; } if ((mg = mg_findext((SV*)io, PERL_MAGIC_uvar, &argvout_vtbl)) && mg->mg_obj) { /* handle to an in-place edit work file */ SV **back_psv = av_fetch((AV*)mg->mg_obj, ARGVMG_BACKUP_NAME, FALSE); SV **temp_psv = av_fetch((AV*)mg->mg_obj, ARGVMG_TEMP_NAME, FALSE); /* PL_oldname may have been modified by a nested ARGV use at this point */ SV **orig_psv = av_fetch((AV*)mg->mg_obj, ARGVMG_ORIG_NAME, FALSE); SV **mode_psv = av_fetch((AV*)mg->mg_obj, ARGVMG_ORIG_MODE, FALSE); SV **pid_psv = av_fetch((AV*)mg->mg_obj, ARGVMG_ORIG_PID, FALSE); #if defined(ARGV_USE_ATFUNCTIONS) SV **dir_psv = av_fetch((AV*)mg->mg_obj, ARGVMG_ORIG_DIRP, FALSE); DIR *dir; int dfd; #elif defined(ARGV_USE_STAT_INO) SV **stat_psv = av_fetch((AV*)mg->mg_obj, ARGVMG_ORIG_CWD_STAT, FALSE); Stat_t *orig_cwd_stat = stat_psv && *stat_psv ? (Stat_t *)SvPVX(*stat_psv) : NULL; #endif #ifndef ARGV_USE_ATFUNCTIONS Stat_t statbuf; #endif UV mode; int fd; const char *orig_pv; assert(temp_psv && *temp_psv); assert(orig_psv && *orig_psv); assert(mode_psv && *mode_psv); assert(pid_psv && *pid_psv); #ifdef ARGV_USE_ATFUNCTIONS assert(dir_psv && *dir_psv); dir = INT2PTR(DIR *, SvIVX(*dir_psv)); dfd = my_dirfd(dir); #endif orig_pv = SvPVX(*orig_psv); mode = SvUV(*mode_psv); if ((mode & (S_ISUID|S_ISGID)) != 0 && (fd = PerlIO_fileno(IoIFP(io))) >= 0) { (void)PerlIO_flush(IoIFP(io)); #ifdef HAS_FCHMOD (void)fchmod(fd, mode); #else (void)PerlLIO_chmod(orig_pv, mode); #endif } retval = io_close(io, NULL, not_implicit, FALSE); if (SvIV(*pid_psv) != (IV)PerlProc_getpid()) { /* this is a child process, don't duplicate our rename() etc processing below */ goto freext; } if (retval) { #ifdef ARGV_USE_STAT_INO /* if the path is absolute the possible moving of cwd (which the file might be in) isn't our problem. This code tries to be reasonably balanced about detecting a changed CWD, if we have the information needed to check that curdir has changed, we check it */ if (!PERL_FILE_IS_ABSOLUTE(SvPVX(*orig_psv)) && orig_cwd_stat && PerlLIO_stat(".", &statbuf) >= 0 && ( statbuf.st_dev != orig_cwd_stat->st_dev || statbuf.st_ino != orig_cwd_stat->st_ino)) { Perl_croak(aTHX_ "Cannot complete in-place edit of %" SVf ": %s", *orig_psv, "Current directory has changed"); } #endif #if !defined(ARGV_USE_ATFUNCTIONS) && !defined(ARGV_USE_STAT_INO) /* Some platforms don't have useful st_ino etc, so just check we can see the work file. */ if (!PERL_FILE_IS_ABSOLUTE(SvPVX(*orig_psv)) && PerlLIO_stat(SvPVX(*temp_psv), &statbuf) < 0) { Perl_croak(aTHX_ "Cannot complete in-place edit of %" SVf ": %s", *orig_psv, "Work file is missing - did you change directory?"); } #endif #if defined(DOSISH) || defined(__CYGWIN__) if (PL_argvgv && GvIOp(PL_argvgv) && IoIFP(GvIOp(PL_argvgv)) && (IoFLAGS(GvIOp(PL_argvgv)) & (IOf_ARGV|IOf_START)) == IOf_ARGV) { do_close(PL_argvgv, FALSE); } #endif if (back_psv && *back_psv) { #if defined(HAS_LINK) && !defined(DOSISH) && !defined(__CYGWIN__) && defined(HAS_RENAME) if ( # ifdef ARGV_USE_ATFUNCTIONS linkat(dfd, orig_pv, dfd, SvPVX(*back_psv), 0) < 0 # else link(orig_pv, SvPVX(*back_psv)) < 0 # endif ) #endif { #ifdef HAS_RENAME if ( # ifdef ARGV_USE_ATFUNCTIONS S_my_renameat(dfd, orig_pv, dfd, SvPVX(*back_psv)) < 0 # else PerlLIO_rename(orig_pv, SvPVX(*back_psv)) < 0 # endif ) { if (!not_implicit) { # ifdef ARGV_USE_ATFUNCTIONS (void)unlinkat(dfd, SvPVX_const(*temp_psv), 0); # else UNLINK(SvPVX(*temp_psv)); # endif Perl_croak(aTHX_ "Can't rename %s to %s: %s, skipping file", SvPVX(*orig_psv), SvPVX(*back_psv), Strerror(errno)); } /* should we warn here? */ goto abort_inplace; } #else (void)UNLINK(SvPVX(*back_psv)); if (link(orig_pv, SvPVX(*back_psv))) { if (!not_implicit) { Perl_croak(aTHX_ "Can't rename %s to %s: %s, skipping file", SvPVX(*orig_psv), SvPVX(*back_psv), Strerror(errno)); } goto abort_inplace; } /* we need to use link() to get the temp into place too, and linK() fails if the new link name exists */ (void)UNLINK(orig_pv); #endif } } #if defined(DOSISH) || defined(__CYGWIN__) || !defined(HAS_RENAME) else { UNLINK(orig_pv); } #endif if ( #if !defined(HAS_RENAME) link(SvPVX(*temp_psv), orig_pv) < 0 #elif defined(ARGV_USE_ATFUNCTIONS) S_my_renameat(dfd, SvPVX(*temp_psv), dfd, orig_pv) < 0 #else PerlLIO_rename(SvPVX(*temp_psv), orig_pv) < 0 #endif ) { if (!not_implicit) { #ifdef ARGV_USE_ATFUNCTIONS (void)unlinkat(dfd, SvPVX_const(*temp_psv), 0); #else UNLINK(SvPVX(*temp_psv)); #endif Perl_croak(aTHX_ "Can't rename in-place work file '%s' to '%s': %s\n", SvPVX(*temp_psv), SvPVX(*orig_psv), Strerror(errno)); } abort_inplace: UNLINK(SvPVX_const(*temp_psv)); retval = FALSE; } #ifndef HAS_RENAME UNLINK(SvPVX(*temp_psv)); #endif } else { #ifdef ARGV_USE_ATFUNCTIONS unlinkat(dfd, SvPVX_const(*temp_psv), 0); #else UNLINK(SvPVX_const(*temp_psv)); #endif if (!not_implicit) { Perl_croak(aTHX_ "Failed to close in-place work file %s: %s", SvPVX(*temp_psv), Strerror(errno)); } } freext: mg_freeext((SV*)io, PERL_MAGIC_uvar, &argvout_vtbl); } else { retval = io_close(io, NULL, not_implicit, FALSE); } if (not_implicit) { IoLINES(io) = 0; IoPAGE(io) = 0; IoLINES_LEFT(io) = IoPAGE_LEN(io); } IoTYPE(io) = IoTYPE_CLOSED; return retval; } bool Perl_io_close(pTHX_ IO *io, GV *gv, bool not_implicit, bool warn_on_fail) { bool retval = FALSE; PERL_ARGS_ASSERT_IO_CLOSE; if (IoIFP(io)) { if (IoTYPE(io) == IoTYPE_PIPE) { const int status = PerlProc_pclose(IoIFP(io)); if (not_implicit) { STATUS_NATIVE_CHILD_SET(status); retval = (STATUS_UNIX == 0); } else { retval = (status != -1); } } else if (IoTYPE(io) == IoTYPE_STD) retval = TRUE; else { if (IoOFP(io) && IoOFP(io) != IoIFP(io)) { /* a socket */ const bool prev_err = PerlIO_error(IoOFP(io)); #ifdef USE_PERLIO if (prev_err) PerlIO_restore_errno(IoOFP(io)); #endif retval = (PerlIO_close(IoOFP(io)) != EOF && !prev_err); PerlIO_close(IoIFP(io)); /* clear stdio, fd already closed */ } else { const bool prev_err = PerlIO_error(IoIFP(io)); #ifdef USE_PERLIO if (prev_err) PerlIO_restore_errno(IoIFP(io)); #endif retval = (PerlIO_close(IoIFP(io)) != EOF && !prev_err); } } IoOFP(io) = IoIFP(io) = NULL; if (warn_on_fail && !retval) { if (gv) Perl_ck_warner_d(aTHX_ packWARN(WARN_IO), "Warning: unable to close filehandle %" HEKf " properly: %" SVf, HEKfARG(GvNAME_HEK(gv)), SVfARG(get_sv("!",GV_ADD))); else Perl_ck_warner_d(aTHX_ packWARN(WARN_IO), "Warning: unable to close filehandle " "properly: %" SVf, SVfARG(get_sv("!",GV_ADD))); } } else if (not_implicit) { SETERRNO(EBADF,SS_IVCHAN); } return retval; } bool Perl_do_eof(pTHX_ GV *gv) { IO * const io = GvIO(gv); PERL_ARGS_ASSERT_DO_EOF; if (!io) return TRUE; else if (IoTYPE(io) == IoTYPE_WRONLY) report_wrongway_fh(gv, '>'); while (IoIFP(io)) { if (PerlIO_has_cntptr(IoIFP(io))) { /* (the code works without this) */ if (PerlIO_get_cnt(IoIFP(io)) > 0) /* cheat a little, since */ return FALSE; /* this is the most usual case */ } { /* getc and ungetc can stomp on errno */ dSAVE_ERRNO; const int ch = PerlIO_getc(IoIFP(io)); if (ch != EOF) { (void)PerlIO_ungetc(IoIFP(io),ch); RESTORE_ERRNO; return FALSE; } RESTORE_ERRNO; } if (PerlIO_has_cntptr(IoIFP(io)) && PerlIO_canset_cnt(IoIFP(io))) { if (PerlIO_get_cnt(IoIFP(io)) < -1) PerlIO_set_cnt(IoIFP(io),-1); } if (PL_op->op_flags & OPf_SPECIAL) { /* not necessarily a real EOF yet? */ if (gv != PL_argvgv || !nextargv(gv, FALSE)) /* get another fp handy */ return TRUE; } else return TRUE; /* normal fp, definitely end of file */ } return TRUE; } Off_t Perl_do_tell(pTHX_ GV *gv) { IO *const io = GvIO(gv); PerlIO *fp; PERL_ARGS_ASSERT_DO_TELL; if (io && (fp = IoIFP(io))) { return PerlIO_tell(fp); } report_evil_fh(gv); SETERRNO(EBADF,RMS_IFI); return (Off_t)-1; } bool Perl_do_seek(pTHX_ GV *gv, Off_t pos, int whence) { IO *const io = GvIO(gv); PerlIO *fp; if (io && (fp = IoIFP(io))) { return PerlIO_seek(fp, pos, whence) >= 0; } report_evil_fh(gv); SETERRNO(EBADF,RMS_IFI); return FALSE; } Off_t Perl_do_sysseek(pTHX_ GV *gv, Off_t pos, int whence) { IO *const io = GvIO(gv); PerlIO *fp; PERL_ARGS_ASSERT_DO_SYSSEEK; if (io && (fp = IoIFP(io))) { int fd = PerlIO_fileno(fp); if (fd < 0 || (whence == SEEK_SET && pos < 0)) { SETERRNO(EINVAL,LIB_INVARG); return -1; } else { return PerlLIO_lseek(fd, pos, whence); } } report_evil_fh(gv); SETERRNO(EBADF,RMS_IFI); return (Off_t)-1; } int Perl_mode_from_discipline(pTHX_ const char *s, STRLEN len) { int mode = O_BINARY; PERL_UNUSED_CONTEXT; if (s) { while (*s) { if (*s == ':') { switch (s[1]) { case 'r': if (s[2] == 'a' && s[3] == 'w' && (!s[4] || s[4] == ':' || isSPACE(s[4]))) { mode = O_BINARY; s += 4; len -= 4; break; } /* FALLTHROUGH */ case 'c': if (s[2] == 'r' && s[3] == 'l' && s[4] == 'f' && (!s[5] || s[5] == ':' || isSPACE(s[5]))) { mode = O_TEXT; s += 5; len -= 5; break; } /* FALLTHROUGH */ default: goto fail_discipline; } } else if (isSPACE(*s)) { ++s; --len; } else { const char *end; fail_discipline: end = strchr(s+1, ':'); if (!end) end = s+len; #ifndef PERLIO_LAYERS Perl_croak(aTHX_ "IO layers (like '%.*s') unavailable", end-s, s); #else len -= end-s; s = end; #endif } } } return mode; } #if !defined(HAS_TRUNCATE) && !defined(HAS_CHSIZE) I32 my_chsize(int fd, Off_t length) { #ifdef F_FREESP /* code courtesy of William Kucharski */ #define HAS_CHSIZE Stat_t filebuf; if (PerlLIO_fstat(fd, &filebuf) < 0) return -1; if (filebuf.st_size < length) { /* extend file length */ if ((PerlLIO_lseek(fd, (length - 1), 0)) < 0) return -1; /* write a "0" byte */ if ((PerlLIO_write(fd, "", 1)) != 1) return -1; } else { /* truncate length */ struct flock fl; fl.l_whence = 0; fl.l_len = 0; fl.l_start = length; fl.l_type = F_WRLCK; /* write lock on file space */ /* * This relies on the UNDOCUMENTED F_FREESP argument to * fcntl(2), which truncates the file so that it ends at the * position indicated by fl.l_start. * * Will minor miracles never cease? */ if (fcntl(fd, F_FREESP, &fl) < 0) return -1; } return 0; #else Perl_croak_nocontext("truncate not implemented"); #endif /* F_FREESP */ return -1; } #endif /* !HAS_TRUNCATE && !HAS_CHSIZE */ bool Perl_do_print(pTHX_ SV *sv, PerlIO *fp) { PERL_ARGS_ASSERT_DO_PRINT; /* assuming fp is checked earlier */ if (!sv) return TRUE; if (SvTYPE(sv) == SVt_IV && SvIOK(sv)) { assert(!SvGMAGICAL(sv)); if (SvIsUV(sv)) PerlIO_printf(fp, "%" UVuf, (UV)SvUVX(sv)); else PerlIO_printf(fp, "%" IVdf, (IV)SvIVX(sv)); return !PerlIO_error(fp); } else { STRLEN len; /* Do this first to trigger any overloading. */ const char *tmps = SvPV_const(sv, len); U8 *tmpbuf = NULL; bool happy = TRUE; if (PerlIO_isutf8(fp)) { /* If the stream is utf8 ... */ if (!SvUTF8(sv)) { /* Convert to utf8 if necessary */ /* We don't modify the original scalar. */ tmpbuf = bytes_to_utf8((const U8*) tmps, &len); tmps = (char *) tmpbuf; } else if (ckWARN4_d(WARN_UTF8, WARN_SURROGATE, WARN_NON_UNICODE, WARN_NONCHAR)) { (void) check_utf8_print((const U8*) tmps, len); } } /* else stream isn't utf8 */ else if (DO_UTF8(sv)) { /* But if is utf8 internally, attempt to convert to bytes */ STRLEN tmplen = len; bool utf8 = TRUE; U8 * const result = bytes_from_utf8((const U8*) tmps, &tmplen, &utf8); if (!utf8) { /* Here, succeeded in downgrading from utf8. Set up to below * output the converted value */ tmpbuf = result; tmps = (char *) tmpbuf; len = tmplen; } else { /* Non-utf8 output stream, but string only representable in utf8 */ assert((char *)result == tmps); Perl_ck_warner_d(aTHX_ packWARN(WARN_UTF8), "Wide character in %s", PL_op ? OP_DESC(PL_op) : "print" ); /* Could also check that isn't one of the things to avoid * in utf8 by using check_utf8_print(), but not doing so, * since the stream isn't a UTF8 stream */ } } /* To detect whether the process is about to overstep its * filesize limit we would need getrlimit(). We could then * also transparently raise the limit with setrlimit() -- * but only until the system hard limit/the filesystem limit, * at which we would get EPERM. Note that when using buffered * io the write failure can be delayed until the flush/close. --jhi */ if (len && (PerlIO_write(fp,tmps,len) == 0)) happy = FALSE; Safefree(tmpbuf); return happy ? !PerlIO_error(fp) : FALSE; } } I32 Perl_my_stat_flags(pTHX_ const U32 flags) { dSP; IO *io; GV* gv; if (PL_op->op_flags & OPf_REF) { gv = cGVOP_gv; do_fstat: if (gv == PL_defgv) return PL_laststatval; io = GvIO(gv); do_fstat_have_io: PL_laststype = OP_STAT; PL_statgv = gv ? gv : (GV *)io; SvPVCLEAR(PL_statname); if (io) { if (IoIFP(io)) { int fd = PerlIO_fileno(IoIFP(io)); if (fd < 0) { /* E.g. PerlIO::scalar has no real fd. */ return (PL_laststatval = -1); } else { return (PL_laststatval = PerlLIO_fstat(fd, &PL_statcache)); } } else if (IoDIRP(io)) { return (PL_laststatval = PerlLIO_fstat(my_dirfd(IoDIRP(io)), &PL_statcache)); } } PL_laststatval = -1; report_evil_fh(gv); return -1; } else if ((PL_op->op_private & (OPpFT_STACKED|OPpFT_AFTER_t)) == OPpFT_STACKED) return PL_laststatval; else { SV* const sv = TOPs; const char *s; STRLEN len; if ((gv = MAYBE_DEREF_GV_flags(sv,flags))) { goto do_fstat; } else if (SvROK(sv) && SvTYPE(SvRV(sv)) == SVt_PVIO) { io = MUTABLE_IO(SvRV(sv)); gv = NULL; goto do_fstat_have_io; } s = SvPV_flags_const(sv, len, flags); PL_statgv = NULL; sv_setpvn(PL_statname, s, len); s = SvPVX_const(PL_statname); /* s now NUL-terminated */ PL_laststype = OP_STAT; PL_laststatval = PerlLIO_stat(s, &PL_statcache); if (PL_laststatval < 0 && ckWARN(WARN_NEWLINE) && should_warn_nl(s)) { GCC_DIAG_IGNORE(-Wformat-nonliteral); /* PL_warn_nl is constant */ Perl_warner(aTHX_ packWARN(WARN_NEWLINE), PL_warn_nl, "stat"); GCC_DIAG_RESTORE; } return PL_laststatval; } } I32 Perl_my_lstat_flags(pTHX_ const U32 flags) { static const char* const no_prev_lstat = "The stat preceding -l _ wasn't an lstat"; dSP; const char *file; SV* const sv = TOPs; bool isio = FALSE; if (PL_op->op_flags & OPf_REF) { if (cGVOP_gv == PL_defgv) { if (PL_laststype != OP_LSTAT) Perl_croak(aTHX_ "%s", no_prev_lstat); return PL_laststatval; } PL_laststatval = -1; if (ckWARN(WARN_IO)) { /* diag_listed_as: Use of -l on filehandle%s */ Perl_warner(aTHX_ packWARN(WARN_IO), "Use of -l on filehandle %" HEKf, HEKfARG(GvENAME_HEK(cGVOP_gv))); } return -1; } if ((PL_op->op_private & (OPpFT_STACKED|OPpFT_AFTER_t)) == OPpFT_STACKED) { if (PL_laststype != OP_LSTAT) Perl_croak(aTHX_ "%s", no_prev_lstat); return PL_laststatval; } PL_laststype = OP_LSTAT; PL_statgv = NULL; if ( ( (SvROK(sv) && ( isGV_with_GP(SvRV(sv)) || (isio = SvTYPE(SvRV(sv)) == SVt_PVIO) ) ) || isGV_with_GP(sv) ) && ckWARN(WARN_IO)) { if (isio) /* diag_listed_as: Use of -l on filehandle%s */ Perl_warner(aTHX_ packWARN(WARN_IO), "Use of -l on filehandle"); else /* diag_listed_as: Use of -l on filehandle%s */ Perl_warner(aTHX_ packWARN(WARN_IO), "Use of -l on filehandle %" HEKf, HEKfARG(GvENAME_HEK((const GV *) (SvROK(sv) ? SvRV(sv) : sv)))); } file = SvPV_flags_const_nolen(sv, flags); sv_setpv(PL_statname,file); PL_laststatval = PerlLIO_lstat(file,&PL_statcache); if (PL_laststatval < 0 && ckWARN(WARN_NEWLINE) && should_warn_nl(file)) { GCC_DIAG_IGNORE(-Wformat-nonliteral); /* PL_warn_nl is constant */ Perl_warner(aTHX_ packWARN(WARN_NEWLINE), PL_warn_nl, "lstat"); GCC_DIAG_RESTORE; } return PL_laststatval; } static void S_exec_failed(pTHX_ const char *cmd, int fd, int do_report) { const int e = errno; PERL_ARGS_ASSERT_EXEC_FAILED; if (ckWARN(WARN_EXEC)) Perl_warner(aTHX_ packWARN(WARN_EXEC), "Can't exec \"%s\": %s", cmd, Strerror(e)); if (do_report) { /* XXX silently ignore failures */ PERL_UNUSED_RESULT(PerlLIO_write(fd, (void*)&e, sizeof(int))); PerlLIO_close(fd); } } bool Perl_do_aexec5(pTHX_ SV *really, SV **mark, SV **sp, int fd, int do_report) { dVAR; PERL_ARGS_ASSERT_DO_AEXEC5; #if defined(__SYMBIAN32__) || defined(__LIBCATAMOUNT__) Perl_croak(aTHX_ "exec? I'm not *that* kind of operating system"); #else assert(sp >= mark); { const char **a; const char *tmps = NULL; Newx(PL_Argv, sp - mark + 1, const char*); a = PL_Argv; while (++mark <= sp) { if (*mark) *a++ = SvPV_nolen_const(*mark); else *a++ = ""; } *a = NULL; if (really) tmps = SvPV_nolen_const(really); if ((!really && PL_Argv[0] && *PL_Argv[0] != '/') || (really && *tmps != '/')) /* will execvp use PATH? */ TAINT_ENV(); /* testing IFS here is overkill, probably */ PERL_FPU_PRE_EXEC if (really && *tmps) { PerlProc_execvp(tmps,EXEC_ARGV_CAST(PL_Argv)); } else if (PL_Argv[0]) { PerlProc_execvp(PL_Argv[0],EXEC_ARGV_CAST(PL_Argv)); } else { SETERRNO(ENOENT,RMS_FNF); } PERL_FPU_POST_EXEC S_exec_failed(aTHX_ (really ? tmps : PL_Argv[0] ? PL_Argv[0] : ""), fd, do_report); } do_execfree(); #endif return FALSE; } void Perl_do_execfree(pTHX) { Safefree(PL_Argv); PL_Argv = NULL; Safefree(PL_Cmd); PL_Cmd = NULL; } #ifdef PERL_DEFAULT_DO_EXEC3_IMPLEMENTATION bool Perl_do_exec3(pTHX_ const char *incmd, int fd, int do_report) { dVAR; const char **a; char *s; char *buf; char *cmd; /* Make a copy so we can change it */ const Size_t cmdlen = strlen(incmd) + 1; PERL_ARGS_ASSERT_DO_EXEC3; Newx(buf, cmdlen, char); cmd = buf; memcpy(cmd, incmd, cmdlen); while (*cmd && isSPACE(*cmd)) cmd++; /* save an extra exec if possible */ #ifdef CSH { char flags[PERL_FLAGS_MAX]; if (strnEQ(cmd,PL_cshname,PL_cshlen) && strEQs(cmd+PL_cshlen," -c")) { my_strlcpy(flags, "-c", PERL_FLAGS_MAX); s = cmd+PL_cshlen+3; if (*s == 'f') { s++; my_strlcat(flags, "f", PERL_FLAGS_MAX - 2); } if (*s == ' ') s++; if (*s++ == '\'') { char * const ncmd = s; while (*s) s++; if (s[-1] == '\n') *--s = '\0'; if (s[-1] == '\'') { *--s = '\0'; PERL_FPU_PRE_EXEC PerlProc_execl(PL_cshname, "csh", flags, ncmd, (char*)NULL); PERL_FPU_POST_EXEC *s = '\''; S_exec_failed(aTHX_ PL_cshname, fd, do_report); Safefree(buf); return FALSE; } } } } #endif /* CSH */ /* see if there are shell metacharacters in it */ if (*cmd == '.' && isSPACE(cmd[1])) goto doshell; if (strEQs(cmd,"exec") && isSPACE(cmd[4])) goto doshell; s = cmd; while (isWORDCHAR(*s)) s++; /* catch VAR=val gizmo */ if (*s == '=') goto doshell; for (s = cmd; *s; s++) { if (*s != ' ' && !isALPHA(*s) && strchr("$&*(){}[]'\";\\|?<>~`\n",*s)) { if (*s == '\n' && !s[1]) { *s = '\0'; break; } /* handle the 2>&1 construct at the end */ if (*s == '>' && s[1] == '&' && s[2] == '1' && s > cmd + 1 && s[-1] == '2' && isSPACE(s[-2]) && (!s[3] || isSPACE(s[3]))) { const char *t = s + 3; while (*t && isSPACE(*t)) ++t; if (!*t && (PerlLIO_dup2(1,2) != -1)) { s[-2] = '\0'; break; } } doshell: PERL_FPU_PRE_EXEC PerlProc_execl(PL_sh_path, "sh", "-c", cmd, (char *)NULL); PERL_FPU_POST_EXEC S_exec_failed(aTHX_ PL_sh_path, fd, do_report); Safefree(buf); return FALSE; } } Newx(PL_Argv, (s - cmd) / 2 + 2, const char*); PL_Cmd = savepvn(cmd, s-cmd); a = PL_Argv; for (s = PL_Cmd; *s;) { while (isSPACE(*s)) s++; if (*s) *(a++) = s; while (*s && !isSPACE(*s)) s++; if (*s) *s++ = '\0'; } *a = NULL; if (PL_Argv[0]) { PERL_FPU_PRE_EXEC PerlProc_execvp(PL_Argv[0],EXEC_ARGV_CAST(PL_Argv)); PERL_FPU_POST_EXEC if (errno == ENOEXEC) { /* for system V NIH syndrome */ do_execfree(); goto doshell; } S_exec_failed(aTHX_ PL_Argv[0], fd, do_report); } do_execfree(); Safefree(buf); return FALSE; } #endif /* OS2 || WIN32 */ I32 Perl_apply(pTHX_ I32 type, SV **mark, SV **sp) { I32 val; I32 tot = 0; const char *const what = PL_op_name[type]; const char *s; STRLEN len; SV ** const oldmark = mark; bool killgp = FALSE; PERL_ARGS_ASSERT_APPLY; PERL_UNUSED_VAR(what); /* may not be used depending on compile options */ /* Doing this ahead of the switch statement preserves the old behaviour, where attempting to use kill as a taint test test would fail on platforms where kill was not defined. */ #ifndef HAS_KILL if (type == OP_KILL) Perl_die(aTHX_ PL_no_func, what); #endif #ifndef HAS_CHOWN if (type == OP_CHOWN) Perl_die(aTHX_ PL_no_func, what); #endif #define APPLY_TAINT_PROPER() \ STMT_START { \ if (TAINT_get) { TAINT_PROPER(what); } \ } STMT_END /* This is a first heuristic; it doesn't catch tainting magic. */ if (TAINTING_get) { while (++mark <= sp) { if (SvTAINTED(*mark)) { TAINT; break; } } mark = oldmark; } switch (type) { case OP_CHMOD: APPLY_TAINT_PROPER(); if (++mark <= sp) { val = SvIV(*mark); APPLY_TAINT_PROPER(); tot = sp - mark; while (++mark <= sp) { GV* gv; if ((gv = MAYBE_DEREF_GV(*mark))) { if (GvIO(gv) && IoIFP(GvIOp(gv))) { #ifdef HAS_FCHMOD int fd = PerlIO_fileno(IoIFP(GvIOn(gv))); APPLY_TAINT_PROPER(); if (fd < 0) { SETERRNO(EBADF,RMS_IFI); tot--; } else if (fchmod(fd, val)) tot--; #else Perl_die(aTHX_ PL_no_func, "fchmod"); #endif } else { SETERRNO(EBADF,RMS_IFI); tot--; } } else { const char *name = SvPV_nomg_const(*mark, len); APPLY_TAINT_PROPER(); if (!IS_SAFE_PATHNAME(name, len, "chmod") || PerlLIO_chmod(name, val)) { tot--; } } } } break; #ifdef HAS_CHOWN case OP_CHOWN: APPLY_TAINT_PROPER(); if (sp - mark > 2) { I32 val2; val = SvIVx(*++mark); val2 = SvIVx(*++mark); APPLY_TAINT_PROPER(); tot = sp - mark; while (++mark <= sp) { GV* gv; if ((gv = MAYBE_DEREF_GV(*mark))) { if (GvIO(gv) && IoIFP(GvIOp(gv))) { #ifdef HAS_FCHOWN int fd = PerlIO_fileno(IoIFP(GvIOn(gv))); APPLY_TAINT_PROPER(); if (fd < 0) { SETERRNO(EBADF,RMS_IFI); tot--; } else if (fchown(fd, val, val2)) tot--; #else Perl_die(aTHX_ PL_no_func, "fchown"); #endif } else { SETERRNO(EBADF,RMS_IFI); tot--; } } else { const char *name = SvPV_nomg_const(*mark, len); APPLY_TAINT_PROPER(); if (!IS_SAFE_PATHNAME(name, len, "chown") || PerlLIO_chown(name, val, val2)) { tot--; } } } } break; #endif /* XXX Should we make lchown() directly available from perl? For now, we'll let Configure test for HAS_LCHOWN, but do nothing in the core. --AD 5/1998 */ #ifdef HAS_KILL case OP_KILL: APPLY_TAINT_PROPER(); if (mark == sp) break; s = SvPVx_const(*++mark, len); if (*s == '-' && isALPHA(s[1])) { s++; len--; killgp = TRUE; } if (isALPHA(*s)) { if (*s == 'S' && s[1] == 'I' && s[2] == 'G') { s += 3; len -= 3; } if ((val = whichsig_pvn(s, len)) < 0) Perl_croak(aTHX_ "Unrecognized signal name \"%" SVf "\"", SVfARG(*mark)); } else { val = SvIV(*mark); if (val < 0) { killgp = TRUE; val = -val; } } APPLY_TAINT_PROPER(); tot = sp - mark; while (++mark <= sp) { Pid_t proc; SvGETMAGIC(*mark); if (!(SvNIOK(*mark) || looks_like_number(*mark))) Perl_croak(aTHX_ "Can't kill a non-numeric process ID"); proc = SvIV_nomg(*mark); APPLY_TAINT_PROPER(); #ifdef HAS_KILLPG /* use killpg in preference, as the killpg() wrapper for Win32 * understands process groups, but the kill() wrapper doesn't */ if (killgp ? PerlProc_killpg(proc, val) : PerlProc_kill(proc, val)) #else if (PerlProc_kill(killgp ? -proc: proc, val)) #endif tot--; } PERL_ASYNC_CHECK(); break; #endif case OP_UNLINK: APPLY_TAINT_PROPER(); tot = sp - mark; while (++mark <= sp) { s = SvPV_const(*mark, len); APPLY_TAINT_PROPER(); if (!IS_SAFE_PATHNAME(s, len, "unlink")) { tot--; } else if (PL_unsafe) { if (UNLINK(s)) { tot--; } #if defined(__amigaos4__) && defined(NEWLIB) else { /* Under AmigaOS4 unlink only 'fails' if the * filename is invalid. It may not remove the file * if it's locked, so check if it's still around. */ if ((access(s,F_OK) != -1)) { tot--; } } #endif } else { /* don't let root wipe out directories without -U */ Stat_t statbuf; if (PerlLIO_lstat(s, &statbuf) < 0) tot--; else if (S_ISDIR(statbuf.st_mode)) { SETERRNO(EISDIR, SS_NOPRIV); tot--; } else { if (UNLINK(s)) { tot--; } #if defined(__amigaos4__) && defined(NEWLIB) else { /* Under AmigaOS4 unlink only 'fails' if the filename is invalid */ /* It may not remove the file if it's Locked, so check if it's still */ /* arround */ if((access(s,F_OK) != -1)) { tot--; } } #endif } } } break; #if defined(HAS_UTIME) || defined(HAS_FUTIMES) case OP_UTIME: APPLY_TAINT_PROPER(); if (sp - mark > 2) { #if defined(HAS_FUTIMES) struct timeval utbuf[2]; void *utbufp = utbuf; #elif defined(I_UTIME) || defined(VMS) struct utimbuf utbuf; struct utimbuf *utbufp = &utbuf; #else struct { Time_t actime; Time_t modtime; } utbuf; void *utbufp = &utbuf; #endif SV* const accessed = *++mark; SV* const modified = *++mark; /* Be like C, and if both times are undefined, let the C * library figure out what to do. This usually means * "current time". */ if ( accessed == &PL_sv_undef && modified == &PL_sv_undef ) utbufp = NULL; else { Zero(&utbuf, sizeof utbuf, char); #ifdef HAS_FUTIMES utbuf[0].tv_sec = (long)SvIV(accessed); /* time accessed */ utbuf[0].tv_usec = 0; utbuf[1].tv_sec = (long)SvIV(modified); /* time modified */ utbuf[1].tv_usec = 0; #elif defined(BIG_TIME) utbuf.actime = (Time_t)SvNV(accessed); /* time accessed */ utbuf.modtime = (Time_t)SvNV(modified); /* time modified */ #else utbuf.actime = (Time_t)SvIV(accessed); /* time accessed */ utbuf.modtime = (Time_t)SvIV(modified); /* time modified */ #endif } APPLY_TAINT_PROPER(); tot = sp - mark; while (++mark <= sp) { GV* gv; if ((gv = MAYBE_DEREF_GV(*mark))) { if (GvIO(gv) && IoIFP(GvIOp(gv))) { #ifdef HAS_FUTIMES int fd = PerlIO_fileno(IoIFP(GvIOn(gv))); APPLY_TAINT_PROPER(); if (fd < 0) { SETERRNO(EBADF,RMS_IFI); tot--; } else if (futimes(fd, (struct timeval *) utbufp)) tot--; #else Perl_die(aTHX_ PL_no_func, "futimes"); #endif } else { tot--; } } else { const char * const name = SvPV_nomg_const(*mark, len); APPLY_TAINT_PROPER(); if (!IS_SAFE_PATHNAME(name, len, "utime")) { tot--; } else #ifdef HAS_FUTIMES if (utimes(name, (struct timeval *)utbufp)) #else if (PerlLIO_utime(name, utbufp)) #endif tot--; } } } else tot = 0; break; #endif } return tot; #undef APPLY_TAINT_PROPER } /* Do the permissions in *statbufp allow some operation? */ #ifndef VMS /* VMS' cando is in vms.c */ bool Perl_cando(pTHX_ Mode_t mode, bool effective, const Stat_t *statbufp) /* effective is a flag, true for EUID, or for checking if the effective gid * is in the list of groups returned from getgroups(). */ { PERL_ARGS_ASSERT_CANDO; PERL_UNUSED_CONTEXT; #ifdef DOSISH /* [Comments and code from Len Reed] * MS-DOS "user" is similar to UNIX's "superuser," but can't write * to write-protected files. The execute permission bit is set * by the Microsoft C library stat() function for the following: * .exe files * .com files * .bat files * directories * All files and directories are readable. * Directories and special files, e.g. "CON", cannot be * write-protected. * [Comment by Tom Dinger -- a directory can have the write-protect * bit set in the file system, but DOS permits changes to * the directory anyway. In addition, all bets are off * here for networked software, such as Novell and * Sun's PC-NFS.] */ /* Atari stat() does pretty much the same thing. we set x_bit_set_in_stat * too so it will actually look into the files for magic numbers */ return cBOOL(mode & statbufp->st_mode); #else /* ! DOSISH */ # ifdef __CYGWIN__ if (ingroup(544,effective)) { /* member of Administrators */ # else if ((effective ? PerlProc_geteuid() : PerlProc_getuid()) == 0) { /* root is special */ # endif if (mode == S_IXUSR) { if (statbufp->st_mode & 0111 || S_ISDIR(statbufp->st_mode)) return TRUE; } else return TRUE; /* root reads and writes anything */ return FALSE; } if (statbufp->st_uid == (effective ? PerlProc_geteuid() : PerlProc_getuid()) ) { if (statbufp->st_mode & mode) return TRUE; /* ok as "user" */ } else if (ingroup(statbufp->st_gid,effective)) { if (statbufp->st_mode & mode >> 3) return TRUE; /* ok as "group" */ } else if (statbufp->st_mode & mode >> 6) return TRUE; /* ok as "other" */ return FALSE; #endif /* ! DOSISH */ } #endif /* ! VMS */ static bool S_ingroup(pTHX_ Gid_t testgid, bool effective) { #ifndef PERL_IMPLICIT_SYS /* PERL_IMPLICIT_SYS like Win32: getegid() etc. require the context. */ PERL_UNUSED_CONTEXT; #endif if (testgid == (effective ? PerlProc_getegid() : PerlProc_getgid())) return TRUE; #ifdef HAS_GETGROUPS { Groups_t *gary = NULL; I32 anum; bool rc = FALSE; anum = getgroups(0, gary); if (anum > 0) { Newx(gary, anum, Groups_t); anum = getgroups(anum, gary); while (--anum >= 0) if (gary[anum] == testgid) { rc = TRUE; break; } Safefree(gary); } return rc; } #else return FALSE; #endif } #if defined(HAS_MSG) || defined(HAS_SEM) || defined(HAS_SHM) I32 Perl_do_ipcget(pTHX_ I32 optype, SV **mark, SV **sp) { const key_t key = (key_t)SvNVx(*++mark); SV *nsv = optype == OP_MSGGET ? NULL : *++mark; const I32 flags = SvIVx(*++mark); PERL_ARGS_ASSERT_DO_IPCGET; PERL_UNUSED_ARG(sp); SETERRNO(0,0); switch (optype) { #ifdef HAS_MSG case OP_MSGGET: return msgget(key, flags); #endif #ifdef HAS_SEM case OP_SEMGET: return semget(key, (int) SvIV(nsv), flags); #endif #ifdef HAS_SHM case OP_SHMGET: return shmget(key, (size_t) SvUV(nsv), flags); #endif #if !defined(HAS_MSG) || !defined(HAS_SEM) || !defined(HAS_SHM) default: /* diag_listed_as: msg%s not implemented */ Perl_croak(aTHX_ "%s not implemented", PL_op_desc[optype]); #endif } return -1; /* should never happen */ } I32 Perl_do_ipcctl(pTHX_ I32 optype, SV **mark, SV **sp) { char *a; I32 ret = -1; const I32 id = SvIVx(*++mark); #ifdef Semctl const I32 n = (optype == OP_SEMCTL) ? SvIVx(*++mark) : 0; #endif const I32 cmd = SvIVx(*++mark); SV * const astr = *++mark; STRLEN infosize = 0; I32 getinfo = (cmd == IPC_STAT); PERL_ARGS_ASSERT_DO_IPCCTL; PERL_UNUSED_ARG(sp); switch (optype) { #ifdef HAS_MSG case OP_MSGCTL: if (cmd == IPC_STAT || cmd == IPC_SET) infosize = sizeof(struct msqid_ds); break; #endif #ifdef HAS_SHM case OP_SHMCTL: if (cmd == IPC_STAT || cmd == IPC_SET) infosize = sizeof(struct shmid_ds); break; #endif #ifdef HAS_SEM case OP_SEMCTL: #ifdef Semctl if (cmd == IPC_STAT || cmd == IPC_SET) infosize = sizeof(struct semid_ds); else if (cmd == GETALL || cmd == SETALL) { struct semid_ds semds; union semun semun; #ifdef EXTRA_F_IN_SEMUN_BUF semun.buff = &semds; #else semun.buf = &semds; #endif getinfo = (cmd == GETALL); if (Semctl(id, 0, IPC_STAT, semun) == -1) return -1; infosize = semds.sem_nsems * sizeof(short); /* "short" is technically wrong but much more portable than guessing about u_?short(_t)? */ } #else /* diag_listed_as: sem%s not implemented */ Perl_croak(aTHX_ "%s not implemented", PL_op_desc[optype]); #endif break; #endif #if !defined(HAS_MSG) || !defined(HAS_SEM) || !defined(HAS_SHM) default: /* diag_listed_as: shm%s not implemented */ Perl_croak(aTHX_ "%s not implemented", PL_op_desc[optype]); #endif } if (infosize) { if (getinfo) { SvPV_force_nolen(astr); a = SvGROW(astr, infosize+1); } else { STRLEN len; a = SvPV(astr, len); if (len != infosize) Perl_croak(aTHX_ "Bad arg length for %s, is %lu, should be %ld", PL_op_desc[optype], (unsigned long)len, (long)infosize); } } else { const IV i = SvIV(astr); a = INT2PTR(char *,i); /* ouch */ } SETERRNO(0,0); switch (optype) { #ifdef HAS_MSG case OP_MSGCTL: ret = msgctl(id, cmd, (struct msqid_ds *)a); break; #endif #ifdef HAS_SEM case OP_SEMCTL: { #ifdef Semctl union semun unsemds; if(cmd == SETVAL) { unsemds.val = PTR2nat(a); } else { #ifdef EXTRA_F_IN_SEMUN_BUF unsemds.buff = (struct semid_ds *)a; #else unsemds.buf = (struct semid_ds *)a; #endif } ret = Semctl(id, n, cmd, unsemds); #else /* diag_listed_as: sem%s not implemented */ Perl_croak(aTHX_ "%s not implemented", PL_op_desc[optype]); #endif } break; #endif #ifdef HAS_SHM case OP_SHMCTL: ret = shmctl(id, cmd, (struct shmid_ds *)a); break; #endif } if (getinfo && ret >= 0) { SvCUR_set(astr, infosize); *SvEND(astr) = '\0'; SvSETMAGIC(astr); } return ret; } I32 Perl_do_msgsnd(pTHX_ SV **mark, SV **sp) { #ifdef HAS_MSG STRLEN len; const I32 id = SvIVx(*++mark); SV * const mstr = *++mark; const I32 flags = SvIVx(*++mark); const char * const mbuf = SvPV_const(mstr, len); const I32 msize = len - sizeof(long); PERL_ARGS_ASSERT_DO_MSGSND; PERL_UNUSED_ARG(sp); if (msize < 0) Perl_croak(aTHX_ "Arg too short for msgsnd"); SETERRNO(0,0); if (id >= 0 && flags >= 0) { return msgsnd(id, (struct msgbuf *)mbuf, msize, flags); } else { SETERRNO(EINVAL,LIB_INVARG); return -1; } #else PERL_UNUSED_ARG(sp); PERL_UNUSED_ARG(mark); /* diag_listed_as: msg%s not implemented */ Perl_croak(aTHX_ "msgsnd not implemented"); return -1; #endif } I32 Perl_do_msgrcv(pTHX_ SV **mark, SV **sp) { #ifdef HAS_MSG char *mbuf; long mtype; I32 msize, flags, ret; const I32 id = SvIVx(*++mark); SV * const mstr = *++mark; PERL_ARGS_ASSERT_DO_MSGRCV; PERL_UNUSED_ARG(sp); /* suppress warning when reading into undef var --jhi */ if (! SvOK(mstr)) SvPVCLEAR(mstr); msize = SvIVx(*++mark); mtype = (long)SvIVx(*++mark); flags = SvIVx(*++mark); SvPV_force_nolen(mstr); mbuf = SvGROW(mstr, sizeof(long)+msize+1); SETERRNO(0,0); if (id >= 0 && msize >= 0 && flags >= 0) { ret = msgrcv(id, (struct msgbuf *)mbuf, msize, mtype, flags); } else { SETERRNO(EINVAL,LIB_INVARG); ret = -1; } if (ret >= 0) { SvCUR_set(mstr, sizeof(long)+ret); *SvEND(mstr) = '\0'; /* who knows who has been playing with this message? */ SvTAINTED_on(mstr); } return ret; #else PERL_UNUSED_ARG(sp); PERL_UNUSED_ARG(mark); /* diag_listed_as: msg%s not implemented */ Perl_croak(aTHX_ "msgrcv not implemented"); return -1; #endif } I32 Perl_do_semop(pTHX_ SV **mark, SV **sp) { #ifdef HAS_SEM STRLEN opsize; const I32 id = SvIVx(*++mark); SV * const opstr = *++mark; const char * const opbuf = SvPV_const(opstr, opsize); PERL_ARGS_ASSERT_DO_SEMOP; PERL_UNUSED_ARG(sp); if (opsize < 3 * SHORTSIZE || (opsize % (3 * SHORTSIZE))) { SETERRNO(EINVAL,LIB_INVARG); return -1; } SETERRNO(0,0); /* We can't assume that sizeof(struct sembuf) == 3 * sizeof(short). */ { const int nsops = opsize / (3 * sizeof (short)); int i = nsops; short * const ops = (short *) opbuf; short *o = ops; struct sembuf *temps, *t; I32 result; Newx (temps, nsops, struct sembuf); t = temps; while (i--) { t->sem_num = *o++; t->sem_op = *o++; t->sem_flg = *o++; t++; } result = semop(id, temps, nsops); Safefree(temps); return result; } #else /* diag_listed_as: sem%s not implemented */ Perl_croak(aTHX_ "semop not implemented"); #endif } I32 Perl_do_shmio(pTHX_ I32 optype, SV **mark, SV **sp) { #ifdef HAS_SHM char *shm; struct shmid_ds shmds; const I32 id = SvIVx(*++mark); SV * const mstr = *++mark; const I32 mpos = SvIVx(*++mark); const I32 msize = SvIVx(*++mark); PERL_ARGS_ASSERT_DO_SHMIO; PERL_UNUSED_ARG(sp); SETERRNO(0,0); if (shmctl(id, IPC_STAT, &shmds) == -1) return -1; if (mpos < 0 || msize < 0 || (size_t)mpos + msize > (size_t)shmds.shm_segsz) { SETERRNO(EFAULT,SS_ACCVIO); /* can't do as caller requested */ return -1; } if (id >= 0) { shm = (char *)shmat(id, NULL, (optype == OP_SHMREAD) ? SHM_RDONLY : 0); } else { SETERRNO(EINVAL,LIB_INVARG); return -1; } if (shm == (char *)-1) /* I hate System V IPC, I really do */ return -1; if (optype == OP_SHMREAD) { char *mbuf; /* suppress warning when reading into undef var (tchrist 3/Mar/00) */ SvGETMAGIC(mstr); SvUPGRADE(mstr, SVt_PV); if (! SvOK(mstr)) SvPVCLEAR(mstr); SvPOK_only(mstr); mbuf = SvGROW(mstr, (STRLEN)msize+1); Copy(shm + mpos, mbuf, msize, char); SvCUR_set(mstr, msize); *SvEND(mstr) = '\0'; SvSETMAGIC(mstr); /* who knows who has been playing with this shared memory? */ SvTAINTED_on(mstr); } else { STRLEN len; const char *mbuf = SvPV_const(mstr, len); const I32 n = ((I32)len > msize) ? msize : (I32)len; Copy(mbuf, shm + mpos, n, char); if (n < msize) memzero(shm + mpos + n, msize - n); } return shmdt(shm); #else /* diag_listed_as: shm%s not implemented */ Perl_croak(aTHX_ "shm I/O not implemented"); return -1; #endif } #endif /* SYSV IPC */ /* =head1 IO Functions =for apidoc start_glob Function called by C to spawn a glob (or do the glob inside perl on VMS). This code used to be inline, but now perl uses C this glob starter is only used by miniperl during the build process, or when PERL_EXTERNAL_GLOB is defined. Moving it away shrinks F; shrinking F helps speed perl up. =cut */ PerlIO * Perl_start_glob (pTHX_ SV *tmpglob, IO *io) { SV * const tmpcmd = newSV(0); PerlIO *fp; STRLEN len; const char *s = SvPV(tmpglob, len); PERL_ARGS_ASSERT_START_GLOB; if (!IS_SAFE_SYSCALL(s, len, "pattern", "glob")) return NULL; ENTER; SAVEFREESV(tmpcmd); #ifdef VMS /* expand the wildcards right here, rather than opening a pipe, */ /* since spawning off a process is a real performance hit */ fp = Perl_vms_start_glob(aTHX_ tmpglob, io); #else /* !VMS */ # ifdef DOSISH # if defined(OS2) sv_setpv(tmpcmd, "for a in "); sv_catsv(tmpcmd, tmpglob); sv_catpv(tmpcmd, "; do echo \"$a\\0\\c\"; done |"); # elif defined(DJGPP) sv_setpv(tmpcmd, "/dev/dosglob/"); /* File System Extension */ sv_catsv(tmpcmd, tmpglob); # else sv_setpv(tmpcmd, "perlglob "); sv_catsv(tmpcmd, tmpglob); sv_catpv(tmpcmd, " |"); # endif # elif defined(CSH) sv_setpvn(tmpcmd, PL_cshname, PL_cshlen); sv_catpv(tmpcmd, " -cf 'set nonomatch; glob "); sv_catsv(tmpcmd, tmpglob); sv_catpv(tmpcmd, "' 2>/dev/null |"); # else sv_setpv(tmpcmd, "echo "); sv_catsv(tmpcmd, tmpglob); sv_catpv(tmpcmd, "|tr -s ' \t\f\r' '\\n\\n\\n\\n'|"); # endif /* !DOSISH && !CSH */ { SV ** const svp = hv_fetchs(GvHVn(PL_envgv), "LS_COLORS", 0); if (svp && *svp) save_helem_flags(GvHV(PL_envgv), newSVpvs_flags("LS_COLORS", SVs_TEMP), svp, SAVEf_SETMAGIC); } (void)do_open6(PL_last_in_gv, SvPVX_const(tmpcmd), SvCUR(tmpcmd), NULL, NULL, 0); fp = IoIFP(io); #endif /* !VMS */ LEAVE; if (!fp && ckWARN(WARN_GLOB)) { Perl_warner(aTHX_ packWARN(WARN_GLOB), "glob failed (can't start child: %s)", Strerror(errno)); } return fp; } /* * ex: set ts=8 sts=4 sw=4 et: */